ping

问题：

ping 192.168.0.91
ping: icmp open socket: Operation not permitted

解决方法

sudo chmod u+s /bin/ping

已解决，不过不知道为什么要这么做    ~~~

ping 192.168.0.91
PING 192.168.0.91 (192.168.0.91) 56(84) bytes of data.
64 bytes from 192.168.0.91: icmp_seq=1 ttl=64 time=0.083 ms